MEDICINE MCQ
RESPIRATORY MEDICINE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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During cellular respiration, what happens to the carbon dioxide?
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It leaves the alveoli and is exhaled from the lungs
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It leaves the bloodstream and enters the alveoli
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It leaves the cells and enters the bloodstream
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It leaves the alveoli and enters the bloodstream
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Explanation:
Detailed explanation-1: -[2] Most of the carbon dioxide diffusing through the capillaries and ultimately into the red blood cells combines with water via a chemical reaction catalyzed by the enzyme carbonic anhydrase catalyzes, forming carbonic acid. Carbonic acid almost immediately dissociates into a bicarbonate anion (HCO3-) and a proton.
Detailed explanation-2: -Usually, the carbon dioxide released through respiration is used up as a reactant in photosynthesis. In the dark, however, when photosynthesis cannot take place, the carbon dioxide is instead released into the atmosphere through pores on the surfaces of the leaves, stems, and roots.
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